The five-time Ballon d'Or winner hasn't always been at his best against Chelsea and has endured some bitter moments.

In 2012, the Argentine missed a penalty against the Blues in the Champions League semi-finals which saw Chelsea advance to the finals with a 3-2 aggregate scoreline. ​Messi was left heartbroken after his missbut Morata thinks it would be stupid of Chelsea to take him lightly.

"Messi can't be stopped," the former Real Madrid striker told Movistar+, as quoted by Goal.

He further stated, "If we can get a good result here, we have to play a defensive game with spaces and try to bother them as much as possible."

Morata (Chelsea): "Messi is unstoppable. We will try to get a good result at home. If we win next week, we will play a defensive game at the Camp Nou." pic.twitter.com/lV0mzcN5GL

Considering Chelsea's form, it will actually be sensible of them to have a measured approach to this tie. Lionel Messi most certainly is the obvious threat, but Barcelona also have some promising players capable of hurting any team in the world. Focusing on Messi just makes Barcelona's job all the more simple, something Chelsea must stay guarded against.

Messi has netted 20 goals in the La Liga this campaign, but could only manage three goals in six Champions League appearances.